/Engine/Source/Editor/UnrealEd/Public/FbxImporter.h
Reorder the material array to follow the fbx file material order
void PostImportStaticMesh ( [UStaticMesh](API\Runtime\Engine\Engine\UStaticMesh) * StaticMesh, [TArray](API\Runtime\Core\Containers\TArray)< FbxNode * > & MeshNodeArray, int32 LODIndex )